EP Equipment LIST JX0, Service Manual

Page: 59 / 206

46
REV. 07/2019
DRIVE SYSTEM
5
5
Fault Motor smoking or burning smell
Cause Stator winding short circuit, motor
burnt
6
Fault Excessive temperature rise
Cause
a. Stator winding short circuit;
b. Motor positive and negative
electrodes with surface
oxidation, resistance increases
and results in heating;
c. Bearing failure, resulting in
severe heating.
5.4.3 Checking and Testing
Checking
- Check if the drive motor and appearance of
cables are in good condition, and if the plug
connection is secure;
- Check if the circuit is connected.
- Carry out ON/OFF test to motor positive and
negative electrodes with a multimeter:
If connected, the motor is normal;
If not connected:
1) Broken circuits in rotor coils (replace the
motor);
2) Carbon brush wearing, move on to the
next step.
Testing
- Replace the carbon brush .
(See Section 5.4.1)
CAUTION
- Remove the cables on the drive motor;
Circuit of drive motor
Positive
Negative
When replacing the carbon brush, replace the
complete set of carbon brushes.
-
-
- Switch off the truck power connections;
Remove the drive assembly(see section 5.1);
Unscrew three screws(2) and remove the
speed encoder(3).
5.5.1 Removal
5.5 Encoder
Encoder is used to detect the speed of the
motor and covert the speed into fixed signals.
5.5.1 Removal and Installation
- Install according to the reverse order of rem-
oval.
Installation